Dinitrogen fixation

Associative dinitrogen fixation Close interaction between a free-living diazotrophic organism and a higher plant that results in an enhanced rate of dinitrogen fixation. 

The molecular basis of biological dinitrogen fixation. W. G. Zumft, Struct. Bonding (Berlin), 1976, 29, 3-65 (347). 

Zumft WG (1976) The Molecular Basis of Biological Dinitrogen Fixation. 29 1-65... 

Domenach, A.M., Kurdali, F. and Bardin, R. 1989 Estimation of symbiotic dinitrogen fixation in alder forest by the method based on natural N-abundance. Plant and Soil 118 51-59. 

Currently, almost all industrial dinitrogen fixation is due to the old Haber-Bosch [2] process. This operates at high temperature and pressure, and uses a promoted metallic-Fe catalyst. The reaction assumed to occur by coordination of both dinitrogen and dihydrogen on the catalyst surface, followed by stepwise assembly of ammonia from these molecules. 

Hardy, R. W. F. Treatise on Dinitrogen Fixation Wiley and Sons, New York, 1979 Section I. 

Fig. 6. Changes in A, gln-y mRNA and B, GS isoenzymes, in nodules following alterations in the rate of dinitrogen fixation. Plants were grown with their root systems enclosed in an atmosphere of either 80% N2/20% Oz or 80% Ar/20% 02 for 15 days following Rhizobium inoculation and then switched to the opposite gaseous regime for 24 or 96 h before harvesting (data from Cock et al., 1990 Chen et at., 1990).

Carbon monoxide inhibits the system to dinitrogen fixation but not to dihydrogen evolution. If dinitrogen fixation is undertaken in the presence of 2H2 then exchange occurs as shown in Eq. (85), but no 2H appears in solution. 

Although dihydrogen inhibits dinitrogen fixation the participation of dinitrogen is necessary for all but about 5% of this 1H2H production. 

Table 1. Lanthanide complexes relevant to the modelling of dinitrogen fixation...

---